Responsibilites regarding reporting colleagues

Hello. I am an ADN student and almost done (3 more weeks ) I have to do a presentation for my clinical group tomorrow on the RN's responsibilites regarding reporting a chemically impaired colleague as well as responsibilities if a colleague is going to be sued for unethical or unsafe practice. Just wanted some insight from more experienced nurses regarding these issues. I know the basics, but am having difficulty on the web finding more specific requirements. Any help is greatly appreciated! Thanks in advance.....

Sara